(n.) A pebble; also, pebbles collectively.

ace asphalt atom bit blacktop carpet causeway cement checkstone cobblestone concrete dab dole dot drakestone dram dribble driblet dwarf farthing fingerstone flag fleck floor flyspeck fragment gobbet grain granule gravelstone groat hair handful iota jackstone jot little little bit metal minim minimum minutiae mite modicum molecule mote nutshell ounce particle pave pebblestone pinch pittance point scruple slingstone smidgen smitch speck spoonful spot tar thimbleful tiny bit tittle trifling amount trivia whit